Generac Power Systems GenTran 6375 Instruction sheet

Installation Guidelines
For
Manual Transfer Switches 6375 / 6377
This manual should remain with the unit.
This manual must be used in conjunction
with the appropriate owner’s manual.
*NOT INTENDED FOR USE IN CRITICAL
LIFE SUPPORT APPLICATIONS.
*ONLY QUALIFIED ELECTRICIANS OR
CONTRACTORS SHOULD ATTEMPT
INSTALLATION!

ii Transfer Switch Installation Guidelines
Forward
Thank you for purchasing a Generac Single Load Manual Transfer Switch to safely connect a portable generator to your
home or business (single phase only), recommended to be used as the disconnect panel for a single 120/240VAC load or to
feed a subpanel for multiple loads, see Installation Diagrams for typical installations. Use where the main electrical panel is
located indoors. This product is suitable for service entrance equipment.
READ THIS MANUAL THOROUGHLY. This manual has been prepared to familiarize personnel involved with the
installation of transfer switches with the manufacturer’s installation requirements. Information and instructions con-
tained herein are not intended to replace or supersede, local, state, or national safety, electrical, and building codes
pertaining to such installations. Applicable laws, codes, and standards must always take precedence over the recom-
mendations contained herein. Always check with the local Authority Having Jurisdiction (AHJ) for the codes or stan-
dards that apply.
Only authorized dealers or qualified, competent installation contractors or electricians thoroughly familiar with applica-
ble codes, standards, and regulations should install this transfer switch. The installation must be in strict compliance
with all codes, standards, and regulations.
It is not intended that this manual be used by any unqualified person for the purpose of installing a transfer switch.
Installation, inspection, and testing of the system must be attempted only by competent, qualified electricians or instal-
lation contractors who are familiar with the equipment and with all installation codes and requirements.
It would be impossible to provide details for every installation configuration. For this reason, much of the information in
this manual is general in nature. Illustrations of typical installations are not intended to serve as specific installation
plans, but may be used in the planning and design process when considering the selection and purchase of a genera-
tor set for standby power applications. Always have the unit specific drawings and manuals on hand before beginning
any installation.
If a portable generator is used to power electrical load circuits normally powered by a utility
power source, it is required by code to install a transfer switch. The transfer switch must
effectively isolate the electrical system from the utility distribution system when the generator
is operating. Failure to isolate an electrical system by such means may result in damage to the
generator and may also result in injury or even death to utility power workers due to backfeed
of electrical energy.
After the transfer switch has been installed, do nothing that might render the installation in non-
compliance with such codes, standards, and regulations. Every effort was made to ensure that
the information in this manual was both accurate and complete at the time it was released.
However, the manufacturer reserves the right to change, alter, or otherwise improve this product
at any time without notice.


WARNING!
California Proposition 65
Engine exhaust and some of its constituents are known to the state of California to cause cancer,
birth defects, and other reproductive harm.
WARNING!
California Proposition 65
This product contains or emits chemicals known to the state of California to cause cancer,
birth defects, and other reproductive harm.

Table of Contents
Transfer Switch Installation Guidelines iii
Section 1 Safety
1.1 Introduction ..........................................................................................................................1
1.2 Safety Rules ..........................................................................................................................1
1.3 General Hazards ...................................................................................................................2
1.4 Electrical Hazards ................................................................................................................2
1.5 Fire Hazards ..........................................................................................................................3
1.6 Explosion Hazards ...............................................................................................................3
1.7 Standards Index ...................................................................................................................3
Section 2 Installation
2.1 Required Tools......................................................................................................................5
2.2 Specifications........................................................................................................................5
2.3 Transfer Switch Installation ................................................................................................5
2.4 Wiring Diagram .....................................................................................................................7
Section 3 Operation
3.1 When a Power Failure Occurs .............................................................................................9
3.2 When Utility Power is Restored...........................................................................................9
Table of Contents
Forward ....................................................................................................................ii

Table of Contents
iv Transfer Switch Installation Guidelines
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Transfer Switch Installation Guidelines 1
Section 1 Safety
1.1 — Introduction
Thank you for purchasing a Generac Transfer Switch to safely connect a portable generator to a single circuit in your
home or business (single phase only) for standby power applications. Product features include:
• Generator Main and Utility Mains mechanically interlocked to prevent utility and generator from feeding circuit at the same time
• This transfer switch is intended to be surface mounted next to an existing load center and wired to one circuit breaker in the main panel.
Read this manual thoroughly.If any portion is not understood, contact the nearest Authorized Generac Service
Dealer for clarification. These individuals are trained/qualified service technicians familiar with the control systems and
available options, and also have full access to drawings, publications, and other information required for a successful
installation.
1.2 — Safety Rules
Throughout this publication, DANGER, WARNING, CAUTION, and NOTE boxes are used to alert personnel to special
instructions about a particular operation that may be hazardous if performed incorrectly or carelessly. Observe them
carefully. They indicate:
Indicates a hazardous situation or action that, if not avoided, will result in death or serious
injury.
Indicates a hazardous situation or action that, if not avoided, could result in death or seri-
ous injury.
Indicates a hazardous situation or action that, if not avoided, could result in minor or mod-
erate injury.
NOTE: Notes provide additional information important to a procedure or component.
These safety warnings cannot eliminate the hazards they indicate. Observing safety precautions and strict compliance
with the special instructions while performing the action or service are essential to preventing accidents.
Four commonly used safety symbols accompany DANGER, WARNING, and CAUTION boxes and the type of
information each indicates: This symbol points out important safety information that, if not followed, could
endanger personnel and/or property.
This symbol represents the potential for an Explosion Hazard.
This symbol represents the potential for a Fire Hazard.
This symbol represents the potential for an Electrical Shock Hazard.
SAVE THESE INSTRUCTIONS. This manual contains important instructions that should be
followed during installation of the transfer switch. The manufacturer suggests that these
safety rules be copied and posted in potential hazard areas. Safety should be stressed
to all installers, operators, potential operators, and service and repair technicians for
this equipment.

$
!
+
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Safety
2Transfer Switch Installation Guidelines
The manufacturer cannot anticipate every possible circumstance that might involve a hazard. The warnings in this
manual, and on tags and decals affixed to the unit, are not all-inclusive. If using a procedure, work method, or operating
technique the manufacturer does not specifically recommend, ensure that it is safe for others. Also make sure the pro-
cedure, work method, or operating technique used does not result in unsafe conditions.
1.3 — General Hazards
•For safety reasons, the manufacturer recommends that this equipment be installed, serviced, and repaired by an
Authorized Service Dealer or other competent, qualified electrician or installation technician who is familiar with
all applicable codes, standards, and regulations.
•Ensure that the transfer switch is installed, operated, and serviced in accordance with the manufacturer’s instruc-
tions and recommendations. Following installation, do nothing that might render the unit unsafe or in noncompli-
ance.
•Keep the area around the transfer switch clean and uncluttered. Remove any materials that could become haz-
ardous.
•When working on this equipment, remain alert at all times. Never work on the equipment when physically or men-
tally fatigued.
•Inspect the portable generator regularly, and promptly repair or replace any worn or damaged components using
only factory approved parts and procedures.
1.4 — Electrical Hazards
•All generators produce dangerous electrical voltages and can cause fatal electrical shock. Utility power delivers
extremely high and dangerous voltages to the transfer switch as well as the generator when it is in operation.
Avoid contact with bare wires, terminals and other connections. Ensure all covers, guards, and barriers are in
place, and that they are properly secured and/or locked before operation. If work must be done around an oper-
ating unit, stand on an insulated, dry surface to reduce potential shock hazard.
•Do not handle any kind of electrical device while standing in water, while barefoot, or while hands or feet are wet.
DANGEROUS ELECTRICAL SHOCK MAY RESULT.
•If it is necessary to stand on metal or concrete while installing, operating, servicing, or repairing this equipment,
lay down a dry wooden platform and cover with insulated mats before beginning.
•Verify that the portable generator is properly grounded.
•Wire gauge sizes of electrical wiring, cables, and cord sets must be adequate to handle the maximum electrical
current (ampacity) to which it will be subjected.
•Before installing or servicing equipment, verify that all power voltage supplies are positively turned off at their
sources. Failure to do so can result in hazardous and possibly fatal electrical shock.
•Connecting a portable generator to an electrical system normally supplied by an electric utility is by means of the
transfer switch so as to isolate the generator’s electric system from the electric utility distribution system when
the portable generator is operating. Failure to isolate the two electric system power sources from each other by
such means will result in damage to the portable generator and may also result in injury or death to utility power
workers due to backfeed of electrical energy.
•In case of accident caused by electric shock, immediately shut down the source of electrical power. If this is not
possible, attempt to free the victim from the live conductor. AVOID DIRECT CONTACT WITH THE VICTIM. Use
a nonconducting implement, such as a dry rope or board, to free the victim from the live conductor. If the victim is
unconscious, apply first aid and get immediate medical help.
•Do not wear jewelry when working on this equipment. Jewelry can conduct electricity resulting in electric shock,
or may get caught in moving parts resulting in injury.

Safety
Transfer Switch Installation Guidelines 3
1.5 — Fire Hazards
•Keep a fire extinguisher near the portable generator and transfer switch at all times. Keep the extinguisher prop-
erly charged and be familiar with its use. Direct any questions to the local fire department.
NOTE: DO NOT use any carbon tetra-chloride type fire extinguishers. These fire extinguishers emit toxic fumes
and the liquid can damage wiring insulation.
1.6 — Explosion Hazards
•Do not smoke around the generator. Immediately wipe up any fuel or oil spills. Ensure that no combustible mate-
rials are left in the generator compartment, or on or near the generator, as FIRE or EXPLOSION may result.
Keep the area surrounding the generator clean and free of debris.
•All types of fuels are potentially FLAMMABLE and/or EXPLOSIVE and must be handled with care. Inspect the
fuel system frequently and correct any leaks immediately. Be sure fuel supply lines are properly installed, purged,
and leak tested before placing the generator set into service.
1.7 — Standards Index
Be sure the transfer switch is in strict compliance with all applicable local, state, and federal laws, codes, and regula-
tions pertaining to such installations. Always use the current version or edition of the applicable law, code, and regula-
tion as it applies to the local jurisdiction.
Generac transfer switches should be installed by a professional electrician familiar with electrical wiring and
codes, and experienced in working with generators. Generac accepts no responsibility for accidents, damages or
personalinjury caused byincorrect installation. This transfer switch is intended for surface mountingOUTDOORS.
Our transfer switches are UL listed to UL Standard 1008 and meet the criteria of National Electrical code Article
702.6 for Optional Standby Systems.
If using the generator and transfer switch for larger appliances, such as electric water heaters, clothes dryers, elec-
tric ranges and small air conditioners, check the labels on the appliances to be sure they do NOT exceed the rating
of the generator. No appliance should have an amperage rating that exceeds the individual breaker rating in the
transfer switch (15 or 30 amps).
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Safety
4Transfer Switch Installation Guidelines
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Transfer Switch Installation Guidelines 5
Section 2 Installation
2.1 — Required Tools
Tools and Items Needed for Installation:
• 1/4” and 11/32” nut drivers
• Straight blade and Phillips screwdriver
• Electric drill, anchors and screws to mount transfer switch to wall
• Wire cutter/stripper
• Wire connectors
• Power Cord to connect generator to switch
2.2 — Specifications
Table 1: SPECIFICATIONS
HAZARDOUS VOLTAGES ARE PRESENT INSIDE TRANSFER SWITCH ENCLOSURES THAT CAN CAUSE DEATH
OR SEVERE PERSONAL INJURY. FOLLOW PROPER INSTALLATION, OPERATION AND MAINTENANCE PROCE-
DURES TO AVOID HAZARDOUS VOLTAGES.
TURN OFF THE MAIN CIRCUIT BREAKER IN THE LOAD CENTER BEFORE STARTING INSTALLATION.
2.3 — Installation Procedure
Model 6375 – 15 amp Furnace Transfer Switch
1. Turn off the main circuit breaker in the load center before starting installation.
2. Furnace transfer switch can be installed to the left or right side of load center. Trial fit the unit, holding up to the
wall about 18” from the center of the load center, and mark the location of the transfer switch and end of har-
ness at load center.
3. Remove the load center cover.
Model 6375 6377
Max Generator Size in Watts 1875 7500
Max Amps 15 Amps @ 125 Volts 30 Amps @ 125/250 Volts
NEMA Configuration of Power Inlet 5-15 L14-30
Voltage 125 Volts 125/250 Volts
NEMA Type Enclosure 3R - Outdoor 3R - Outdoor
Phase 11
Minimum Gauge / Cord Size 12/3 10/4
+
+

Installation
6Transfer Switch Installation Guidelines
4. Locate and remove a ½” KO from the bottom of the load center where marked in Step 1. Insert harness wires
from transfer switch through KO and install conduit fitting.
5. Remove and retain the two screws that secure interior assembly to the transfer switch enclosure.
6. Lift and pull out interior assembly to provide access to the four (4) mounting holes at the back of the enclosure.
Mount transfer switch enclosure in desired position using installer-provided fasteners through the four (4)
mounting holes in back of enclosure. Re-install interior assembly into enclosure (be sure not to pinch any wires
between the enclosure and interior assembly) by hooking the top of the interior assembly deadfront over the
studs on the inside of the enclosure and securing the interior assembly to the enclosure with the two screws
removed in Step 4. You are now ready to connect the transfer switch wires to the desired circuit inside the load
center.
7. Turn OFF the circuit breaker in the load center that you want to connect to the transfer switch. Loosen the
screw that secures the wire into the circuit breaker and remove the wire from the circuit breaker.
8. Insert the RED (UTIL) wire from the transfer switch into the circuit breaker and tighten screw.
9. Using a wire connector, connect the wire removed from the circuit breaker in Step 6 with the BLACK (LOAD)
wire coming from the transfer switch.
10. Insert and tighten the WHITE (neutral) wire from the transfer switch into the NEUTRAL bar in the load center.
Insert and tighten the GREEN (ground) wire from the transfer switch into the GROUND bar in the load center.
If there is no ground bar, insert and tighten it into the NEUTRAL bar.
11. Reinstall load center cover. Turn on circuit breaker turned off in Step 6. Transfer switch is now ready for testing
and operation.
Model 6377 – 30 amp 2-pole Transfer Switch
1. Turn off the main circuit breaker in the load center before starting installation.
2. This transfer switch can be installed to the left or right side of load center. Trial fit the unit, holding up to the wall
about 18” from the center of the Load Center, and mark the location of the transfer switch and end of harness
at load center.
3. Remove the load center cover.
4. Open front cover of transfer switch by removing screw near bottom. Remove and retain the two screws that
secure interior assembly to the enclosure. Lift and pull out interior assembly.
5. If required, remove KO on the back of the enclosure before mounting the enclosure. Connect fitting to back
KO. Then mount enclosure in desired position using installer-provided fasteners through the four (4) mounting
holes in back of enclosure, and seal the four mounting fasteners.
6. If required, remove side KO(s) and install appropriate fittings and conduit.
7. Pull in appropriate quantity, size and color (green/white/black/red) wire into the enclosure.
8. Insert the WHITE (neutral) wire pulled into the enclosure into the “W” terminal on the inlet mounted on the inte-
rior assembly and tighten terminal screw OR connect to the WHITE (neutral) pigtail installed on the inlet using
a wire connector.
9. Use wire connectors (installer-provided) to make these connections:
a. Connect the GREEN (ground) wire pulled into the enclosure with the GREEN (ground) pigtail attached to
the interior assembly,
b. Connect the UTIL wire(s) pulled into the enclosure to the RED lead(s) marked UTIL on the interior assem-
bly and
c. Connect the LOAD wire(s) pulled into the enclosure to the BLACK lead(s) marked LOAD on the interior
assembly.
10. Fold wires and re-install interior assembly into enclosure (be sure not to pinch any wires between the enclo-
sure and interior assembly) by hooking the top of the interior assembly deadfront over the studs on the inside
of the enclosure and secure the interior assembly to the enclosure with the two screws removed in Step 3.
Transfer switch is now ready for testing and operation.

Installation
Transfer Switch Installation Guidelines 7
2.4 — Wiring Diagram

Installation
8Transfer Switch Installation Guidelines
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Transfer Switch Installation Guidelines 9
Section 3 Operation
NEVERrun portable generatorsindoorsorin garages, basements, orsheds.Portable generators should always be
used at least 5 feet away from windows, doors, vents, or any other opening. Carbon Monoxide (CO) from a genera-
tor is deadly and can kill you in minutes. Read and follow all generator directions before use.
3.1 — When a power failure occurs:
1. Move generator outdoors. Never operate a generator indoors or in an enclosed area.
2. Open the front and bottom covers on the transfer switch.
3. Plug generator cord into generator and the power inlet on the bottom of the transfer switch. Start generator.
4. Turn UTIL breaker OFF (down) and slide interlock mechanism over UTIL breaker.
5. Turn GEN breaker ON (up) and generator power should start to power the load(s).
3.2 — When utility power is restored:
1. Turn OFF (down) the GEN breaker on transfer switch and slide the interlock mechanism over GEN breaker.
2. Turn ON (up) the UTIL breaker.
3. Turn off generator and disconnect generator cord. Cool down generator, store generator and cord in dry
location.
4. Close cover(s) on transfer switch and secure/lock as needed.
*

Operation
10 Transfer Switch Installation Guidelines
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Part No. 0K4377 Rev. C 08/02/13 Printed in USA
© Generac Power Systems, Inc. All rights reserved
Specifications are subject to change without notice.
No reproduction allowed in any form without prior written
consent from Generac Power Systems, Inc.
Generac Power Systems, Inc.
S45 W29290 Hwy. 59
Waukesha, WI 53189
1-888-GENERAC (1-888-436-3722)
generac.com

¡PELIGRO!
Directrices de instalación
para
Interruptores de transferencia
manuales 6375/6377
Este manual debe permanecer con la unidad.
Este manual se debe usar en conjunto con el
apropiado manual del propietario.
*NO ESTÁN DESTINADOS AL USO EN
APLICACIONES CRÍTICAS DE
SOPORTE A LA VIDA HUMANA.
*¡SOLO ELECTRICISTAS O
CONTRATISTAS CUALIFICADOS DEBEN
INTENTAR LA INSTALACIÓN!

ii Directrices de instalación del interruptor de transferencia
Prólogo
Gracias por comprar un interruptor de transferencia manual para una única carga de Generac para conectar con
seguridad un generador portátil (monofásico solamente) en su hogar o empresa, recomendado para ser usado como
tablero de desconexión para una única carga de 120/240 VCA o para alimentar un subtablero para múltiples cargas.
Vea los diagramas de instalación para las instalaciones típicas. Úselo donde el tablero eléctrico principal esté ubicado
en interiores. Este producto es adecuado para equipos de acometida eléctrica.
LEA ESTE MANUAL MINUCIOSAMENTE. Este manual se ha preparado para familiarizar al personal involucrado en
la instalación de interruptores de transferencia con los requisitos de instalación del fabricante. La información y las
instrucciones del presente no tienen la intención de sustituir o reemplazar los códigos locales, estatales o nacionales
de seguridad, electricidad y construcción relativos a dichas instalaciones. Las leyes, códigos y normas
correspondientes siempre deben tener precedencia sobre las recomendaciones dadas en el presente. Siempre
compruebe con la Autoridad que tiene jurisdicción local (AHJ) los códigos y normas que correspondan.
Este interruptor de transferencia solo debe ser instalado por concesionarios autorizados, contratistas de instalación o
electricistas competentes y cualificados que estén familiarizados con los códigos, normas y reglamentos aplicables. La
instalación debe ser con estricto cumplimiento de todos los códigos, normas y reglamentos.
No es propósito de este manual ser usado por ninguna persona no cualificada con el propósito de instalar un
interruptor de transferencia. La instalación, inspección y prueba del sistema solo debe ser intentada por electricistas o
contratistas de instalación competentes y cualificados, que estén familiarizados con los equipos y con todos los
códigos y requisitos de la instalación.
Es imposible proporcionar detalles para cada configuración de instalación. Por esta razón, gran parte de la información
de este manual es de naturaleza genérica. Las ilustraciones de instalaciones típicas no tienen el propósito de servir
como planes de instalación específicos, pero pueden ser usadas en el proceso de planificación y diseño al considerar
la selección y compra de un grupo electrógeno para aplicaciones de alimentación de reserva. Siempre tenga a mano
los planos y manuales específicos de la unidad antes de comenzar cualquier instalación.
Si se usa este generador portátil para alimentar circuitos de cargas eléctricas normalmente
alimentados por una fuente de alimentación del servicio público, los códigos requieren instalar un
interruptor de transferencia. El interruptor de transferencia debe aislar efectivamente el sistema
eléctrico del sistema de distribución del servicio público cuando funciona el generador. No aislar un
sistema eléctrico mediante tales medios puede ocasionar daños al generador y también puede
provocar lesiones o la muerte a los trabajadores del servicio público de electricidad debido a la
realimentación de energía eléctrica.
Luego de que el interruptor de transferencia haya sido instalado, no haga nada que pudiera hacer que la
instalación no cumpla con dichos códigos, normas y reglamentos. Hemos hecho todos los esfuerzos
para asegurar que la información y las instrucciones de este manual fueron precisas y completas en el
momento de emitir este manual. Sin embargo, el fabricante se reserva el derecho de cambiar, alterar o
de alguna otra manera mejorar este producto en cualquier momento sin aviso.
¡PELIGRO!


¡ADVERTENCIA!
California proposición 65
El escape del motor y algunos de sus componentes son conocidos por el Estado de
California como causa de cáncer, defectos congénitos y otros daños reproductivos.
¡ADVERTENCIA!
California proposición 65
Este producto contiene o emite sustancias químicas que son conocidas por el Estado de
California como causa de cáncer, defectos congénitos y otros daños reproductivos.

Contenido
Directrices de instalación del interruptor de transferencia iii
Sección 1 Seguridad
1.1 Introducción ......................................................................................................................... 1
1.2 Reglas de seguridad ............................................................................................................ 1
1.3 Generalidades sobre peligro ............................................................................................... 2
1.4 Peligros eléctricos ............................................................................................................... 2
1.5 Peligros de incendio ............................................................................................................ 3
1.6 Peligro de explosión ............................................................................................................ 3
1.7 Índice de normas .................................................................................................................. 3
Sección 2 Instalación
2.1 Herramientas requeridas ..................................................................................................... 5
2.2 Especificaciones .................................................................................................................. 5
2.3 Procedimiento de instalación ............................................................................................. 5
2.4 Diagrama de cableado ......................................................................................................... 7
Sección 3 Operación
3.1 Cuando ocurre una falla de alimentación .......................................................................... 9
3.2 Cuando se restablece la alimentación del servicio público ............................................ 9
Contenido
Prólogo .....................................................................................................................ii

Contenido
iv Directrices de instalación del interruptor de transferencia
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